<template>
    <div>
        <border-header second="商品管理" third="添加商品"></border-header>

        <el-card>
            <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tabs栏 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="item1" v-for="(item1,i1) in item.attr_vals" :key="i1"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                            action="https://lianghj.top:8888/api/private/v1/upload"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="headleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器插件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
import BorderHeader from '../BorderHeader.vue'
import http from '@/util/http'
// 引入富文本编辑器
import { quillEditor } from 'vue-quill-editor'
import 'quill/dist/quill.core.css'
import 'quill/dist/quill.snow.css'
import 'quill/dist/quill.bubble.css'
// 引入lodaash
import _ from 'lodash'

export default {
  data () {
    return {
      // 步骤条默认被激活的步骤
      activeIndex: '0',
      // 表单的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 级联选择器所选分类的id的数组
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 表单验证对象
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 所有商品分类数据
      cateList: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 上传的图片的完整地址
      previewPath: '',
      // 图片预览的显示与隐藏
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  components: {
    BorderHeader,
    quillEditor
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const { data: res } = await http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类列表失败')
      this.cateList = res.data
    },
    // 级联选择器选中项发生改变时触发的函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 切换标签页发生的函数
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // 点击tabs标签页时发生的函数
    async tabClicked () {
      // 如果activeIndex为1，则发起请求，获取动态参数列表
      // 如果activeIndex为2，则发起请求，获取静态属性列表
      if (this.activeIndex === '1') {
        const { data: res } = await http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败')
        // 处理attr_vals数据
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败')
        this.onlyTableData = res.data
      }
    },
    // 处理预览图片效果
    handlePreview (file) {
      // file为这张图片的信息
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片效果
    handleRemove (file) {
      // file为将要移除的图片的信息
      // 1.先找到要移除图片的路径
      const filePath = file.response.data.tmp_path
      // 2.根据路径找到其所在数组的下标值(使用findIndex)
      const i = this.addForm.pics.findIndex(item => item.pic === filePath)
      // 3.使用数组方法splice删除这一项
      this.addForm.pics.splice(i, 1)
    },
    // 文件上传成功时的钩子函数
    headleSuccess (response) {
      // response为上传成功后返回的数据
      // 将所需数据拼接成一个对象
      const picObj = {
        pic: response.data.tmp_path
      }
      // 将拼接的对象push到数组中
      this.addForm.pics.push(picObj)
    },
    // 添加商品的按钮
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单')
        // 发起请求前做一些处理，对addForm进行深拷贝(使用lodash插件)
        const form = _.cloneDeep(this.addForm)
        // 然后将goods_cat数组转为字符串
        form.goods_cat = form.goods_cat.join(',')
        // 对动态参数你与静态列表进行处理
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const { data: res } = await http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  // 计算属性
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin-right: 10px !important;
}
.previewImg{
    width: 100%;
}
.ql-editor{
    min-height: 300px;
}
.btnAdd{
    margin-top: 15px;
}
</style>
